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From: Segher Boessenkool <segher@kernel.crashing.org>
To: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Haren Myneni <haren@linux.ibm.com>,
	mpe@ellerman.id.au, hch@infradead.org, mikey@neuling.org,
	npiggin@gmail.com, herbert@gondor.apana.org.au,
	linuxppc-dev@lists.ozlabs.org, devicetree@vger.kernel.org,
	sukadev@linux.vnet.ibm.com
Subject: Re: [PATCH V2 00/13] powerpc/vas: Page fault handling for user space NX requests
Date: Mon, 9 Dec 2019 02:38:06 -0600	[thread overview]
Message-ID: <20191209083806.GA3152@gate.crashing.org> (raw)
In-Reply-To: <8ba807dd-9d5a-e42a-60e8-f9ad648026bf@c-s.fr>

Hi!

On Mon, Dec 09, 2019 at 06:37:09AM +0100, Christophe Leroy wrote:
> What do you mean by NX ?

It is the Power9 "Nest Accelerator".  The patch series should ideally
mention that right at the start, yeah.

> Up to now, NX has been standing for No-eXecute. That's a bit in segment 
> registers on book3s/32 to forbid executing code.

That bit is called just N fwiw (and not really specific to 32-bit -- on
64-bit implementations it was part of segment table entries, and of SLB
entries on newer machines).


Segher

  reply	other threads:[~2019-12-09  8:38 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-09  3:18 [PATCH V2 00/13] powerpc/vas: Page fault handling for user space NX requests Haren Myneni
2019-12-09  3:26 ` [PATCH V2 01/13] powerpc/vas: Describe vas-port and interrupts properties Haren Myneni
2019-12-09  3:27 ` [PATCH V2 02/13] powerpc/vas: Define nx_fault_stamp in coprocessor_request_block Haren Myneni
2019-12-09  3:29 ` [PATCH V2 03/13] powerpc/vas: Read interrupts and vas-port device tree properties Haren Myneni
2019-12-09  3:30 ` [PATCH V2 04/13] powerpc/vas: Setup fault window per VAS instance Haren Myneni
2019-12-12 12:55   ` Christoph Hellwig
2019-12-09  3:31 ` [PATCH V2 05/13] powerpc/vas: Setup thread IRQ handler " Haren Myneni
2019-12-12 12:59   ` Christoph Hellwig
2019-12-09  3:32 ` [PATCH V2 06/13] powerpc/vas: Register NX with fault window ID and IRQ port value Haren Myneni
2019-12-09  3:32 ` [PATCH V2 07/13] powerpc/vas: Take reference to PID and mm for user space windows Haren Myneni
2019-12-12 13:02   ` Christoph Hellwig
2019-12-17  5:35     ` Haren Myneni
2019-12-09  3:33 ` [PATCH V2 08/13] powerpc/vas: Update CSB and notify process for fault CRBs Haren Myneni
2019-12-12 13:07   ` Christoph Hellwig
2019-12-09  3:34 ` [PATCH V2 09/13] powerpc/vas: Print CRB and FIFO values Haren Myneni
2019-12-09  3:34 ` [PATCH V2 10/13] powerpc/vas: Do not use default credits for receive window Haren Myneni
2019-12-09  3:35 ` [PATCH V2 11/13] powerpc/vas: Return credits after handling fault Haren Myneni
2019-12-09  3:36 ` [PATCH V2 12/13] powerpc/vas: Display process stuck message Haren Myneni
2019-12-09  3:37 ` [PATCH V2 13/13] powerpc/vas: Free send window in VAS instance after credits returned Haren Myneni
2019-12-09  5:37 ` [PATCH V2 00/13] powerpc/vas: Page fault handling for user space NX requests Christophe Leroy
2019-12-09  8:38   ` Segher Boessenkool [this message]
2019-12-12  5:05     ` Haren Myneni
2019-12-12  5:38 ` Haren Myneni

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